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Journal articles on the topic 'MWCO'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Jacangelo, J. G., A. Madec, K. J. Schwab, D. E. Huffman, and C. S. Mysore. "Advances in the use of low-pressure, hollow fiber membranes for the disinfection of water." Water Supply 5, no. 5 (2005): 109–15. http://dx.doi.org/10.2166/ws.2005.0045.

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Low-pressure membranes are often used for disinfection purposes. Using a simple bench-scale testing unit, several membranes were evaluated for their capability to remove microorganisms under specific conditions. Five hollow fiber modified polysulfone membranes ranging in molecular weight cutoff (MWCO) from 10,000 to 300,000 daltons and a 0.2 μm nominal pore size membrane were also evaluated. The 10,000 MWCO membrane removed less virus than the two 100,000 MWCO or the 300,000 MWCO membranes. The data from this study suggests that MWCO and specific flux may not, in all cases, be a good predictor

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Fadel, Mariam, Yvan Wyart, and Philippe Moulin. "An Efficient Method to Determine Membrane Molecular Weight Cut-Off Using Fluorescent Silica Nanoparticles." Membranes 10, no. 10 (2020): 271. http://dx.doi.org/10.3390/membranes10100271.

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Membrane processes have revolutionized many industries because they are more energy and environmentally friendly than other separation techniques. This initial selection of the membrane for any application is based on its Molecular Weight Cut-Off (MWCO). However, there is a lack of a quantitative, liable, and rapid method to determine the MWCO of the membrane. In this study, a methodology to determine the MWCO, based on the retention of fluorescent silica nanoparticles (NPs), is presented. Optimized experimental conditions (Transmembrane pressure, filtration duration, suspension concentration,

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3

Kadel, Sabita, Geneviève Pellerin, Jacinthe Thibodeau, Véronique Perreault, Carole Lainé, and Laurent Bazinet. "How Molecular Weight Cut-Offs and Physicochemical Properties of Polyether Sulfone Membranes Affect Peptide Migration and Selectivity during Electrodialysis with Filtration Membranes." Membranes 9, no. 11 (2019): 153. http://dx.doi.org/10.3390/membranes9110153.

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Filtration membranes (FMs) are an integral part of electrodialysis with filtration membranes (EDFM), a green and promising technology for bioactive peptide fractionation. Therefore, it is paramount to understand how physicochemical properties of FMs impact global and selective peptide migration to anionic (A−RC) and cationic (C+RC) peptide recovery compartments during their simultaneous separation by EDFM. In this context, six polyether sulfone (PES) membranes with molecular weight cut-offs (MWCO) of 5, 10, 20, 50, 100 and 300 kDa were characterized and used during EDFM to separate peptides fr

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4

Khalid, Mansoor, Muhammad Usman, Mohammad Siddiq, et al. "Removal of Ni(II) from aqueous solution by using micellar enhanced ultrafiltration." Water Science and Technology 72, no. 6 (2015): 946–51. http://dx.doi.org/10.2166/wst.2015.216.

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To explore the potential of micellar enhanced ultrafiltration (MEUF) process for the treatment of industrial effluent, herein, we report the surfactant-based separation of a metal ion [Ni(II)] from the aqueous solution using two different anionic surfactants viz. dioctyl sodium sulfosuccinate (DSS) and sodium dodecyl sulfate (SDS). By following a systematic investigation, we utilized two membranes with different pore sizes viz. 10,000 MWCO (molecular weight cutoff) and 30,000 MWCO and determined the rejection coefficient and permeate flux of the Ni(II) from aqueous at 1.5 bar trans-membrane pr

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5

Dixon, M. B., C. Falconet, L. Ho, C. W. K. Chow, B. K. O'Neill, and G. Newcombe. "Nanofiltration for the removal of algal metabolites and the effects of fouling." Water Science and Technology 61, no. 5 (2010): 1189–99. http://dx.doi.org/10.2166/wst.2010.903.

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Nanofiltration (NF) has been shown to be an effective way of removing organic micropollutants from drinking water due to its size exclusion properties. A rapid bench scale membrane test unit was utilised to trial six NF membranes to remove the algal metabolites, microcystin, cylindrospermopsin, 2-methylisoborneol (MIB) and geosmin (GSM). Membrane fouling due to the algal metabolites was observed for both charged and neutral metabolites. MIB and GSM were removed effectively by low molecular weight cut-off (MWCO) membranes but less effectively by a higher MWCO membrane. Removal of MIB and GSM by

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6

C.-H., Kim, M. Hosomi, A. Murakami, and M. Okada. "Characteristics of fouling due to clay-organic substances in potable water treatment by ultrafiltration." Water Science and Technology 34, no. 9 (1996): 157–64. http://dx.doi.org/10.2166/wst.1996.0201.

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Effects of clay on fouling due to organic substances and clay were evaluated by model fouling materials and kaolin. Model fouling materials selected were protein, polysaccharide, fulvic acid, humic acid and algogenic matter (EOM:ectracellular organic matter, microbial decomposition products) and kaolin was selected as the clay material. Polysulfone membrane (MWCO(Molecular Weight Cut-Off) 10,000, 50,000 and 200,000) was used as an ultrafiltration membrane. In particular, the flux measurement of solutions containing algogenic matter used an ultrafiltration membrane of MWCO 50,000. The flux of p

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7

Tomczak, Wirginia, and Marek Gryta. "The Application of Polyethersulfone Ultrafiltration Membranes for Separation of Car Wash Wastewaters: Experiments and Modelling." Membranes 13, no. 3 (2023): 321. http://dx.doi.org/10.3390/membranes13030321.

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The wastewater generated as a result of car washes is considered a new source of water. However, recovered water must meet the required quality criteria for reuse. For this purpose, the ultrafiltration (UF) process can be successfully used. The main aim of the present work was to investigate the influence of the membrane’s molecular weight cut-off (MWCO) on the UF performance in terms of the fouling phenomenon and retention degree of car wash wastewater. Moreover, for a better understanding of the fouling mechanisms, Hermia’s model was used. The experimental studies were conducted with the use

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8

You, S. H., and C. T. Wu. "Fouling Removal of UF Membrane with Coated TiO2Nanoparticles under UV Irradiation for Effluent Recovery during TFT-LCD Manufacturing." International Journal of Photoenergy 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/650281.

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An ultrafiltration (UF) membrane process was employed to treat the secondary effluent discharged from a manufacturing of thin film transistor-liquid crystal display (TFT-LCD) in this study. A bench-scale system was performed to evaluate the fouling removal of a UF membrane with coated titanium dioxide (TiO2) nanoparticles under UV irradiation. The operating pressure and feed temperature were controlled at 300 KN/m2and 25°C, respectively. It was found that the optimum operating conditions were attained with TiO2concentrations of 10 wt% for both 5 KD and 10 KD MWCO. Continuous UV irradiation of

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9

Sankarannair, Sabarinath, Pranav Prasannakumar, Vinod Vt Padil, et al. "Synthesis and Characterisation of Biobased Grease Derived from Chemically Modified Waste Cooking Oil." Ecological Chemistry and Engineering S 31, no. 4 (2024): 551–68. https://doi.org/10.2478/eces-2024-0036.

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Abstract As the global population rises, the dependency on edible oils also rises. The used oil possesses environmental concerns due to improper waste oil disposal. This study emphasises the feasibility of repurposing waste cooking oil (WCO) for eco-friendly lubricating grease production, emphasising enhanced stability and performance through chemical modifications. Chemical modifications, primarily transesterification, enhance the oxidative stability and chemical properties of WCO. Gas chromatography and mass spectroscopy analyse the fatty acid profile, and the hot oil oxidation test (HOOT) a

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10

Ali, Asmadi, Rosli Mohd Yunus, Mohamad Awang, and Sofiah Hamzah. "Influence of Shear Rate on Proteins Separation, Molecular Weight Cut-Off and Average Pore Size of Polysulfone Blend Membranes." Advanced Materials Research 974 (June 2014): 247–51. http://dx.doi.org/10.4028/www.scientific.net/amr.974.247.

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Rheological factor such as shear rate during membrane fabrication process has an effect on structural properties and performance of membranes. Flat sheet asymmetric polysulfone/cellulose acetate phthalate/polyvinylpyrrolidone (PSf/CAP/PVP) blend membranes were prepared by using an automatic casting machine at different shear rates in the range of 42.0 to 210.0 s-1. The blend membranes prepared at different shear rate were characterized in terms of its structural properties (molecular weight cut-off (MWCO) and average pore size) and performance (proteins separation). The results showed that inc

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11

Li, Qiuxing, Runyu Zhang, Guopei Huang, Haijun Yuan, Liying Wang, and Shuxia Xu. "Characterization of Low-Molecular-Weight Dissolved Organic Matter Using Optional Dialysis and Orbitrap Mass Spectrometry." Molecules 29, no. 14 (2024): 3370. http://dx.doi.org/10.3390/molecules29143370.

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Low-molecular-weight (LMW, <1000 Da) dissolved organic matter (DOM) plays a significant role in metal/organic pollutant complexation, as well as photochemical/microbiological processes in freshwater ecosystems. The micro size and high reactivity of LMW-DOM hinder its precise characterization. In this study, Suwannee River fulvic acid (SRFA), a commonly used reference material for aquatic DOM, was applied to examine the optical features and molecular composition of LMW-DOM by combining membrane separation, ultraviolet–visible absorption and Orbitrap mass spectrometry (MS) characterization. T

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12

Mantel, Tomi, Paul Benne, Stanislav Parsin, and Mathias Ernst. "Electro-Conductive Composite Gold-Polyethersulfone-Ultrafiltration-Membrane: Characterization of Membrane and Natural Organic Matter (NOM) Filtration Performance at Different In-Situ Applied Surface Potentials." Membranes 8, no. 3 (2018): 64. http://dx.doi.org/10.3390/membranes8030064.

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Next to the pore size distribution, surface charge is considered to be one main factor in the separation performance of ultrafiltration (UF) membranes. By applying an external surface potential onto an electro-conductive UF membrane, electrostatic induced rejection was investigated. This study introduces in a first part a relatively simple but yet not reported technology of membrane modification with direct current sputter deposition of ultrathin (15 nm) highly conductive gold layers. In a second part, characterization of the gold-coated UF flat sheet membrane with a molecular weight cut-off (

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13

Teixeira, M. Ribau, H. Lucas, and M. J. Rosa. "A rapid small scale evaluation of ultrafiltration performance for surface water treatment at Alcantarilha's water treatment works (Algarve, Portugal)." Water Supply 4, no. 5-6 (2004): 199–206. http://dx.doi.org/10.2166/ws.2004.0109.

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A rapid small-scale evaluation of ultrafiltration (UF) performance with and without physical–chemical pre-treatment was performed to up-grade the conventional treatment used for drinking water production in Alcantarilha's water treatment works, Algarve, Portugal. Direct UF and pre-ozonation/coagulation/flocculation/sedimentation/UF (O/C/F/S/UF) were evaluated using polysulphone membranes of different apparent molecular weight cut-off (MWCO) (15–47 kDa). The results indicated that (i) UF is an effective barrier against microorganisms, including virus larger than 80 nm; (ii) for surface waters w

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14

Loewe, Daniel, Tanja A. Grein, Hauke Dieken, Tobias Weidner, Denise Salzig, and Peter Czermak. "Tangential Flow Filtration for the Concentration of Oncolytic Measles Virus: The Influence of Filter Properties and the Cell Culture Medium." Membranes 9, no. 12 (2019): 160. http://dx.doi.org/10.3390/membranes9120160.

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The therapeutic use of oncolytic measles virus (MV) for cancer treatment requires >108 infectious MV particles per dose in a highly pure form. The concentration/purification of viruses is typically achieved by tangential flow filtration (TFF) but the efficiency of this process for the preparation of MV has not been tested in detail. We therefore investigated the influence of membrane material, feed composition, and pore size or molecular weight cut-off (MWCO) on the recovery of MV by TFF in concentration mode. We achieved the recovery of infectious MV particles using membranes with a MWCO ≤

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15

Irfan, Muhammad, Masooma Irfan, Ani Idris, et al. "Effect of Dope Flow Rate and Post-Treatment on the Morphology, Permeation and Metal Ion Rejection from PES/LiBr-Based UF Hollow Fiber Membranes." Membranes 12, no. 3 (2022): 305. http://dx.doi.org/10.3390/membranes12030305.

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This study investigated the influence of dope extrusion rate (DER) and post-treatment effect on the morphology, permeation, and metal ion rejection by polyethersulfone/lithium bromide (PES/LiBr)-based hollow fiber (HF) membranes. HF fibers were spun with 2.25, 2.5, and 3.1 ratios of DER to bore fluid rate (BFR), wherein DER varied from 11.35, 12.5, to 15.6 mL/min with a fixed BFR (5 mL/min). Molecular weight cutoff (MWCO), pore size, water flux, and flux recovery ratio were determined, whereas lake water was used to observe the rejection rate of dissolved metallic ions. Results showed that wit

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16

Nguyen, Hau Thi, Nguyen Cong Nguyen, Shiao-Shing Chen, and Shu-Ying Wu. "Concentrate of surfactant-based draw solutions in forward osmosis by ultrafiltration and nanofiltration." Water Supply 15, no. 5 (2015): 1133–39. http://dx.doi.org/10.2166/ws.2015.060.

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The exploration of coupling surfactants with highly charged phosphate as novel draw solutions for forward osmosis (FO) to minimize salt leakage and enhance draw solute recovery at low energy is presented for the first time. In this work, anionic (sodium dodecyl sulfate (SDS)), cationic (cetyltrimethylammonium bromide) and non-ionic (polyethylene glycol tert-octylphenyl ether, TX-100) surfactants were used to couple with Na3PO4 for enlarging draw solution particle size that could improve the solute retention. Three kinds of nanofiltration (NF) membranes (HL, DL and TS80 with molecular weight cu

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17

Ait Baih, Mohamed, Nour Elyakin El Qacemi, Hamid Zidouh, et al. "Elaboration of TiO2 Ultrafiltration Membrane Deposited on Moroccan Sahara Clay." E3S Web of Conferences 229 (2021): 01033. http://dx.doi.org/10.1051/e3sconf/202122901033.

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In this work, the porous ceramic multilayer ultrafiltration membrane is developed. Macroporous support was formed by extrusion of ceramic paste derived from natural Moroccan Sahara Clay. The microporous interlayer was then performed by slip casting from zirconia commercial powders and finally the active ultrafiltration toplayer was obtained by solgel route using TiO2 sol. The performance of TiO2 ultrafiltration membrane was evaluated by pores diameter, thickness of the top layer, water flux, and molecular weight cut off (MWCO). The water permeability measured for this composite membrane is 9.0

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18

Seo, G. T., T. S. Lee, B. H. Moon, and J. H. Lim. "Ultrafiltration combined with ozone for domestic laundry wastewater reclamation and reuse." Water Supply 1, no. 5-6 (2001): 387–92. http://dx.doi.org/10.2166/ws.2001.0138.

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Ozone was incorporated into an ultrafiltration system to produce higher quality reclaimed water from domestic laundry wastewater. Characteristics of the wastewater for initial washing waste were 488~2,847 mg/L COD, 62~674 mg/L MBAS, and 38~857 mg/L SS. The wastewater was contacted with ozone in a 10L storage tank and circulated through the membrane module for inner pressurized cross-flow filtration. The concentrate was returned back to the contact tank. The membrane used in this experiment was hollow fiber polysulfone UF membrane with MWCO 5,000 and 10,000. It has an effective filtration area

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19

Sousa, Mayko Rannany S., Jaime Lora-García, María-Fernanda López-Pérez, Asunción Santafé-Moros, and José M. Gozálvez-Zafrilla. "Operating Conditions Optimization via the Taguchi Method to Remove Colloidal Substances from Recycled Paper and Cardboard Production Wastewater." Membranes 10, no. 8 (2020): 170. http://dx.doi.org/10.3390/membranes10080170.

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Optimization of the ultrafiltration (UF) process to remove colloidal substances from a paper mill’s treated effluent was investigated in this study. The effects of four operating parameters in a UF system (transmembrane pressure (TMP), cross-flow velocity (CFV), temperature and molecular weight cut-off (MWCO)) on the average permeate flux (Jv), organic matter chemical oxygen demand (COD) rejection rate and the cumulative flux decline (SFD), was investigated by robust experimental design using the Taguchi method. Analysis of variance (ANOVA) for an L9 orthogonal array were used to determine the

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20

Yammine, Sami, Robin Rabagliato, Xavier Vitrac, Martine Mietton Peuchot, and Rémy Ghidossi. "The use of nanofiltration membranes for the fractionation of polyphenols from grape pomace extracts." OENO One 53, no. 1 (2019): 11–26. http://dx.doi.org/10.20870/oeno-one.2019.53.1.2342.

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Filtration experiments in batch concentration mode (with recycling of the retentate stream) of grape pomace extract were performed in laboratory filtration membrane equipment by using nine commercial nanofiltration (NF) membranes with an approximate molecular weight cut-off (MWCO) of 1000‒150 Da. The filtration experiments of the selected pomace extract were performed by modifying the most important operating variables: transmembrane pressure, tangential velocity, temperature, and the nature and MWCO of the membranes. The evolution of the cumulative permeate volumes and permeate fluxes with pr

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21

Yang, Kun, Ze-Bin Guo, and Kun-Ping Li. "Membrane–based separation and concentration of total flavone glycosides from Desmodium styracifolium." E3S Web of Conferences 145 (2020): 01016. http://dx.doi.org/10.1051/e3sconf/202014501016.

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Desmodium styracifolium is one of the traditional Chinese herbs. In the present study, membrane-based technologies were used to separate and concentrate of the total flavone glycosides fraction from D. styracifolium. The extracts flowed through an ultrafiltration membrane which MWCO (molecular weight cut-off) is 30KDa and the permeate was concentrated by MWCO-1KDa nano-filtration membrane. The solid content of the membrane concentrated extracts of D. styracifolium (MEDs) was 26.5 mg/ml. Moreover, the content of vicenin-2, schaftoside and isovitexin in MEDs were 4.88 %, 9.76 %, 1.89 % respectiv

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22

Giacobbo, Alexandre, Isabella Franco Pasqualotto, Rafael Cabeleira de Coronel Machado Filho, Miguel Minhalma, Andréa Moura Bernardes, and Maria Norberta de Pinho. "Ultrafiltration and Nanofiltration for the Removal of Pharmaceutically Active Compounds from Water: The Effect of Operating Pressure on Electrostatic Solute—Membrane Interactions." Membranes 13, no. 8 (2023): 743. http://dx.doi.org/10.3390/membranes13080743.

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The present work investigates nanofiltration (NF) and ultrafiltration (UF) for the removal of three widely used pharmaceutically active compounds (PhACs), namely atenolol, sulfamethoxazole, and rosuvastatin. Four membranes, two polyamide NF membranes (NF90 and NF270) and two polyethersulfone UF membranes (XT and ST), were evaluated in terms of productivity (permeate flux) and selectivity (rejection of PhACs) at pressures from 2 to 8 bar. Although the UF membranes have a much higher molecular weight cut-off (1000 and 10,000 Da), when compared to the molecular weight of the PhACs (253–482 Da), m

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23

Shahgodari, Shirin, Jordi Labanda, and Joan Llorens. "Experimental and Modeling Study of the Nanofiltration of Alcohol-Based Molecules and Amino Acids by Commercial Membranes." Membranes 13, no. 7 (2023): 631. http://dx.doi.org/10.3390/membranes13070631.

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The nanofiltration performance of three commercial membranes was analyzed by the Steric Pore Model (SPM) and the extended Nernst–Planck diffusion equation inside membrane pores. The model was completed with the equation to predict the concentration polarization, and the mass transfer coefficient was determined by considering the presence of a feed spacer. The model parameters that characterized the performance of the membrane were the hydrodynamic coefficient, which accounts for the possible variations in solute size and membrane pore radius, the effective membrane thickness, and the water per

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Liu, Jian Guo, Meng Meng Yin, Meng Wang, Chang Zhen Chen, and Hu Zhu. "Isolation and Purification of a Hyperthermostable Superoxide Dismutase from Thermus thermophilus HB27 Using Two-Stage Ultrafiltration." Advanced Materials Research 396-398 (November 2011): 1601–4. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1601.

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In the present work, a hyperthermostable superoxide dismutase (SOD) was isolated from Thermus thermophilus HB27 using a membrane-based process after being expressed in E. coli. It was found that a two-stage ultrafiltration process using a 100 kDa MWCO regenerated cellulose (RC) membrane and a 50 kDa MWCO polyethersulfone (PES) membrane could successfully employed to isolate SOD from the crude feedstock. The effects of solution pH, ionic strength and permeate flux on the transmission of proteins were quantified using parameter scanning ultrafiltration. Under optimized conditions, the purity of

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25

Muñoz, Paul, Karla Pérez, Alfredo Cassano, and René Ruby-Figueroa. "Recovery of Anthocyanins and Monosaccharides from Grape Marc Extract by Nanofiltration Membranes." Molecules 26, no. 7 (2021): 2003. http://dx.doi.org/10.3390/molecules26072003.

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Wastewaters and by-products generated in the winemaking process are important and inexpensive sources of value-added compounds that can be potentially reused for the development of new products of commercial interest (i.e., functional foods). This research was undertaken in order to evaluate the potential of nanofiltration (NF) membranes in the recovery of anthocyanins and monosaccharides from a clarified Carménère grape marc obtained through a combination of ultrasound-assisted extraction and microfiltration. Three different flat-sheet nanofiltration (NF) membranes, covering the range of mole

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26

Dillmann, Saskia, Shambhavi Arvind Kaushik, Jakob Stumme, and Mathias Ernst. "Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection." Membranes 10, no. 12 (2020): 412. http://dx.doi.org/10.3390/membranes10120412.

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The characterization of membranes is suitable to investigate changes in the membrane properties caused by Layer-by-Layer (LbL) modification. Besides permeability, rejection, and molecular-weight cut-off (MWCO), which give information about the modification of the separation behaviour of the membrane, the zeta potential is capable of describing the surface charge of the membrane and its variation impacted by the properties of the polyelectrolyte multilayers (PEM). In this study, a new method for zeta potential measurement of hollow fibre membranes with several capillaries was developed and furt

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27

Rokhati, Nur, Titik Istirokhatun, Nur ‘Aini Hamada, and Dwi Titik Apriyanti. "Membrane Technology Application for Fractionation Process to Obtain High Quality Glucosamine." Reaktor 20, no. 2 (2020): 103–8. http://dx.doi.org/10.14710/reaktor.20.2.103-108.

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Glucosamine, monosaccharide from chitosan obtained from the chitin deacetylation process, has been used widely in various fields such as nutrition, pharmacy, and cosmetics. Glucosamine can be obtained from the hydrolysis of chitosan. Enzymatic hydrolysis provides the advantage of mild reaction conditions, environmentally friendly, and high yield. But until now, the separation of glucosamine from the chitosan hydrolysis fraction has been an obstacle. Ultrafiltration membranes offer an efficient filtration process because they do not require additional chemicals. The performance of ultrafiltrati

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Ratnaweera, Harsha, Egil Gjessing, and Eivind Oug. "Influence of Physical-Chemical Characteristics of Natural Organic Matter (NOM) on Coagulation Properties: An Analysis of Eight Norwegian Water Sources." Water Science and Technology 40, no. 9 (1999): 89–95. http://dx.doi.org/10.2166/wst.1999.0450.

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Coagulation behaviour of eight natural water samples containing NOM is investigated to identify parameters influencing the process. A strong correlation between colour, DOC and UV-abs. was shown, regardless of the source and fractions. Coagulation of original water samples is discussed using analytical parameters in raw water and various molecular weight fractions. Over 40% of colour is given by NOM fractions with molecular weight cut-off (MWCO) &lt; 10kD with one exception. About 13 of the colour is given by MWCO fractions &gt; 50 kD for all waters. Larger NOM molecules required less

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Liu, Shu Xing, and Bei Wang. "Purification of Ferulic Acid from Wheat by Ultrafiltration Technology." Advanced Materials Research 524-527 (May 2012): 2294–97. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.2294.

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Purification extraction of ferulic acid from wheat bran by using ultrafiltration,based on the molecular weight cutoff (MWCO) of ultrafiltration membranes,ultrafiltration pressure,sample concentration,ultrafiltration time these four factors influence of the membrane flux,determine the best the ultrafiltration conditions.

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Gonzaga, Karen, and Jose Carlos Mierzwa. "Comparison between two Polyethersulfone concentrations in hollow fiber ultrafiltration membranes. Is it worth to use more polymer?" Eclética Química Journal 46, no. 1 (2021): 52–60. http://dx.doi.org/10.26850/1678-4618eqj.v46.1.2021.p52-60.

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Polyethersulfone (PES) hollow fiber membranes were fabricated using dry-jet wet spinning technique, a phase inversion method, with 16 and 20% PES, N-methyl-2-pyrrolidone (NMP) as solvent and tap water as nonsolvent, in order to evaluate if the amount of polymer has a significant effect on its properties. They were characterized using SEM for a morphological analysis, a continuous system to measure pure water permeability (PWP) and molecular weight cutoff (MWCO), and a universal testing machine to tensile tests. The obtained results for PWP was an average of about 220 L m- ² h-1 bar-1 for the 1

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31

Akbari, Ahmad, Zahra Fakharshakeri, and Sayed Majid Mojallali Rostami. "A novel positively charged membrane based on polyamide thin-film composite made by cross-linking for nanofiltration." Water Science and Technology 73, no. 4 (2015): 776–89. http://dx.doi.org/10.2166/wst.2015.538.

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In this paper, a novel positively charged membrane was prepared through interfacial polymerization technique between polyethyleneimine in aqueous phase and trimesoyl chloride in organic phase. Next, cross-linking of polyamide (PA) layer using ρ-xylylene dichloride (XDC) and glutaraldehyde (GA) was studied. The influences of cross-linking concentrations on the separation and permeation performance of membrane were also investigated. Membranes were characterized in terms of their chemical structure, the cross-sectional and surface morphologies, contact angles, molecular weight cut-off (MWCO) and

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Magueijo, Vitor, Viriato Semião, and Maria Norberta de Pinho. "Effect of Membrane Pore Size and Membrane-Solute Interactions on Lysozyme Ultrafiltration." Materials Science Forum 514-516 (May 2006): 1483–87. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.1483.

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A model based on steric hindrance mechanisms [1] is used to determine the pore sizes of two ultrafiltration (UF) membranes. The lysozyme rejection coefficients of those membranes are predicted through the same model after modification of the pore size and solute radius by taking into account the development of electric double layers. Two asymmetric cellulose acetate membranes M1 and M2 were prepared and characterized. Membrane M1 has an hydraulic permeability of 2.1x10-6 m/s/bar, a molecular weight cut-off (MWCO) of 30,000 Da and an average pore radius of 2.6 nm. Membrane M2 has an hydraulic p

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Tian, Huali, Xing Wu, and Kaisong Zhang. "Polydopamine-Assisted Two-Dimensional Molybdenum Disulfide (MoS2)-Modified PES Tight Ultrafiltration Mixed-Matrix Membranes: Enhanced Dye Separation Performance." Membranes 11, no. 2 (2021): 96. http://dx.doi.org/10.3390/membranes11020096.

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Tight ultrafiltration (TUF) membranes with high performance have attracted more and more attention in the separation of organic molecules. To improve membrane performance, some methods such as interface polymerization have been applied. However, these approaches have complex operation procedures. In this study, a polydopamine (PDA) modified MoS2 (MoS2@PDA) blending polyethersulfone (PES) membrane with smaller pore size and excellent selectivity was fabricated by a simple phase inversion method. The molecular weight cut-off (MWCO) of as-prepared MoS2@PDA mixed matrix membranes (MMMs) changes, a

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Uçar, Deniz. "Membrane processes for the reuse of car washing wastewater." Journal of Water Reuse and Desalination 8, no. 2 (2017): 169–75. http://dx.doi.org/10.2166/wrd.2017.036.

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Abstract This study investigates alternative treatments of car wash effluents. The car wash wastewater was treated by settling, filtration, and membrane filtration processes. During settling, total solid concentration decreased rapidly within the first 2 hours and then remained constant. Chemical oxygen demand (COD) and conductivity were decreased by 10% and 4%, respectively. After settling, wastewater was filtered throughout a 100 μm filter. It was found that filtration had a negligible effect on COD removal. Finally, wastewater was filtered by four ultrafiltration membranes of varying molecu

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Conidi, Egea-Corbacho, and Cassano. "A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes." Polymers 11, no. 11 (2019): 1868. http://dx.doi.org/10.3390/polym11111868.

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Polyamide commercial membranes in flat-sheet configuration and with molecular weight cut-off (MWCO) in the range of ultrafiltration (UF) to nanofiltration (NF) were tested for the recovery of phenolic compounds from clarified olive mill solid waste (OMSW) aqueous extracts. The performance of selected membranes was evaluated in terms of productivity (permeate flux) and selectivity towards biologically active compounds (such as phenolic compounds, flavanols, and hydroxycinnamic acids derivatives) and total antioxidant activity (TAA) as a function of transmembrane pressure (TMP). NF membranes pro

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Lin, Weiyun, Liang Jing, and Baiyu Zhang. "Micellar-Enhanced Ultrafiltration to Remove Nickel Ions: A Response Surface Method and Artificial Neural Network Optimization." Water 12, no. 5 (2020): 1269. http://dx.doi.org/10.3390/w12051269.

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Nickel ions from aqueous solutions were removed by micellar-enhanced ultrafiltration (MEUF), using the surfactant sodium dodecyl sulfate (SDS) as a chelating agent. Process variables and indicators were modeled and optimized by a response surface methodology (RSM), using the Box–Behnken design (BBD). The generated quadratic models described the relationship between a performance indicator (nickel rejection rate or permeate flux) and process variables (pressure, nickel concentration, SDS concentration, and molecular weight cut-off (MWCO)). The analysis of variance (ANOVA) showed that both model

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Vazquez, Elizabeth, Claudia Muro, Sergio Pérez-Sicairos, Yolanda Alvarado, Vianney Díaz-Blancas, and Karina Hernández. "Synthesis of Responsive Membranes for Water Recovery through Desalination of Saline Industrial Effluents." Sustainability 16, no. 13 (2024): 5796. http://dx.doi.org/10.3390/su16135796.

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Polysulfone (PSF) and smart polymers (SRPs)—including polyacrylic acid (AAc), poly N-isopropylacrylamide (NIPA), and sulfonated poly(1,4-phenylene ether-ether-sulfone) (SPEES)—were used in the synthesis of responsive membranes (PSF-SRP) for application in sustainable desalination processes involving food industry effluents for water recovery and recycling. With the inclusion of SRPs, PSF-SRP membranes showed different characteristics when compared to the PSF membrane. AAc caused fibers to occur in the surface structure, increasing the MWCO of the PSF membrane, whereas NIPA and SPEES diminished

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Taufiqur, Rohman, Baroroh Lili Utami Umi, and MAhmud. "PENGARUH KONSENTRASI KITOSAN TERHADAP KARAKTER MEMBRAN KITOSAN." Jurnal Ilmiah Berkala Sains dan Terapan Kimia 3, no. 1 (2009): 14–24. https://doi.org/10.5281/zenodo.579780.

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Telah dilakukan penelitian tentang pengaruh konsentrasi kitosan terhadap karakter membran kitosan. Penelitian ini bertujuan untuk mengkaji pengaruh konsentrasi kitosan terhadap permeabilitas, permselektivitas, dan modulus Young. Penelitian juga bertujuan untuk mengetahui nilai <em>Molecular Weight Cut-Off</em> (MWCO) dan morfologi membran kitosan. Pembuatan larutan cetak membran digunakan dua komponen yaitu kitosan sebagai polimer, dan asam asetat sebagai pelarut. Sintesis membran kitosan dilakukan dengan teknik inversi fasa, yaitu dengan proses rendam endap. Pada larutan dope, digunakan kitos

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Taufiqur, Rohman, Baroroh Lili Utami Umi, and Mahmud. "PENGARUH KONSENTRASI KITOSAN TERHADAP KARAKTER MEMBRAN KITOSAN." Jurnal Ilmiah Berkala Sains dan Terapan kimia 3, no. 1 (2009): 14–24. https://doi.org/10.5281/zenodo.822515.

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Telah dilakukan penelitian tentang pengaruh konsentrasi kitosan terhadap karakter membran kitosan. Penelitian ini bertujuan untuk mengkaji pengaruh konsentrasi kitosan terhadap permeabilitas, permselektivitas, dan modulus Young. Penelitian juga bertujuan untuk mengetahui nilai Molecular Weight Cut-Off (MWCO) dan morfologi membran kitosan. Pembuatan larutan cetak membran digunakan dua komponen yaitu kitosan sebagai polimer, dan asam asetat sebagai pelarut. Sintesis membran kitosan dilakukan dengan teknik inversi fasa, yaitu dengan proses rendam endap. Pada larutan dope, digunakan kitosan dengan

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Hacıoğlu, Ahmet, Ursula Tania Zoua Assoumou, Melis Yıldız, Aslı Arslan Kulcan, İbrahim Yavuz, and Mustafa Karhan. "Cevap Yüzey Metodu Kullanılarak Keçiboynuzu Ekstraktında Bulunan D-Pinitolün Nanofiltrasyon Uygulamasıyla Zenginleştirilmesinin Optimize Edilmesi." Turkish Journal of Agriculture - Food Science and Technology 8, no. 9 (2020): 1846–53. http://dx.doi.org/10.24925/turjaf.v8i9.1846-1853.3429.

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In this study, it was aimed to enrich D-pinitol in carob extract using nanofilters in the range of 1-5 kDa molecular weight cut-off (MWCO). Enrichment stages were extraction, clarification, adsorbent application and nanofiltration applications. The Box-Behnken Response Surface Methodology (RSM) was used to optimize nanofiltration application. D-pinitol content, sugar composition, total phenolic matters (TPC), total dry matters (TDM) and total minerals were determined for the purity control of the product obtained in the final stage. The highest D-pinitol concentration in extracts was achieved

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Costa, A. R., and M. N. de Pinho. "Coagulation/flocculation/ultrafiltration for natural organic matter removal in drinking water production." Water Supply 4, no. 5-6 (2004): 215–22. http://dx.doi.org/10.2166/ws.2004.0111.

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Membrane fouling by natural organic matter (NOM), namely by humic substances (HS), is a major problem in water treatment for drinking water production using membrane processes. Membrane fouling is dependent on membrane morphology like pore size and on water characteristics namely NOM nature. This work addresses the evaluation of the efficiency of ultrafiltration (UF) and Coagulation/Flocculation/UF performance in terms of permeation fluxes and HS removal, of the water from Tagus River (Valada). The operation of coagulation with chitosan was evaluated as a pretreatment for minimization of membr

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Amy, G., T. U. Kim, J. Yoon, et al. "Removal of micropollutants by NF/RO membranes." Water Supply 5, no. 5 (2005): 25–33. http://dx.doi.org/10.2166/ws.2005.0035.

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Organic and inorganic micropollutants are rejected by high-pressure membranes, nanofiltration (NF) and reverse osmosis (RO), primarily as a consequence of solute–membrane interactions. These interactions include steric and electrostatic effects that depend on compound properties (e.g., molecular weight (MW) and ionic charge) and membrane properties (e.g., molecular weight cutoff (MWCO) and surface charge (zeta potential)), with the added influence of membrane operating conditions (e.g., recovery). This paper summarizes the rejection trends by several NF and RO membranes for a wide range of org

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Hidalgo, A. M., M. Gómez, M. D. Murcia, M. Serrano, R. Rodríguez-Schmidt, and P. A. Escudero. "Behaviour of polysulfone ultrafiltration membrane for dyes removal." Water Science and Technology 77, no. 8 (2018): 2093–100. http://dx.doi.org/10.2166/wst.2018.124.

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Abstract Although ultrafiltration membranes have been used for the separation of macromolecules and colloids from solutions, this process has a limited application in the removal of dyes present in coloured discharges of textile industry, as these typically have much lower molecular weight than the molecular cut-off of the membranes (MWCO). In the present work, we have evaluated the behaviour of a polysulfone ultrafiltration membrane in the removal of different dyes from aqueous solutions (Congo red, methyl green and amaranth). Different variables (tangential flow rate, concentration of dye an

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Hegoburu, Ignacio, Karina Listiarini Zedda, and Svetlozar Velizarov. "Treatment of Electroplating Wastewater Using NF pH-Stable Membranes: Characterization and Application." Membranes 10, no. 12 (2020): 399. http://dx.doi.org/10.3390/membranes10120399.

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Industrial adoption of nanofiltration (NF) for treatment of low-pH wastewater is hindered by the limited membrane lifetime at strongly acidic conditions. In this study, the electroplating wastewater (EPWW) filtration performance of a novel pH-stable NF membrane is compared against a commercial NF membrane and a reverse osmosis (RO) membrane. The presented membrane is relatively hydrophobic and has its isoelectric point (IEP) at pH 4.1, with a high and positive zeta potential of +10 mV at pH 3. A novel method was developed to determine the molecular weight cut-off (MWCO) at a pH of 2, with a fi

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Hanson, L. E., and C. R. Howell. "Elicitors of Plant Defense Responses from Biocontrol Strains of Trichoderma viren." Phytopathology® 94, no. 2 (2004): 171–76. http://dx.doi.org/10.1094/phyto.2004.94.2.171.

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Effective biocontrol strains of Trichoderma virens can induce the production of defense-related compounds in the roots of cotton. Ineffective strains do not induce these compounds to significant levels. This elicittation was found to be heat stable, insoluble in chloroform, passed through a 5K molecular weight cut-off (MWCO) filter, but not a 3K MWCO filter, and was sensitive to treatment by proteinase K. When the active material was subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis, several bands were present in the material from biocontrol-active strains that were lackin

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Abd-Razak, Nurul Hainiza, M. N. Zairossani, Y. M. John Chew, and Michael R. Bird. "Fouling Analysis and the Recovery of Phytosterols from Orange Juice Using Regenerated Cellulose Ultrafiltration Membranes." Food and Bioprocess Technology 13, no. 11 (2020): 2012–28. http://dx.doi.org/10.1007/s11947-020-02541-7.

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Abstract This study describes the use of regenerated cellulose (RCA) membranes with molecular weight cut-off (MWCO) values of 10, 30, and 100 kDa, respectively, to separate phytosterols from orange juice for possible nutraceutical production. A desirable membrane separation rejects protein whilst transmitting phytosterols and other low molecular mass compounds such as sugars. The ultrafiltration was performed in a cross-flow membrane system with a total filtration area of 336 cm2. Total phytosterol analysis was carried out by using a Liebermann-Buchard-based method. Protein concentration was q

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Jun, Byung-Moon, Yeomin Yoon, and Chang Min Park. "Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater." Water 11, no. 8 (2019): 1645. http://dx.doi.org/10.3390/w11081645.

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This research focused on the influence of post-treatment using alkali-catalyzed hydrolysis with a full-aromatic nanofiltration (NF) polyamide membrane and its application to the efficient removal of selected dyes. The post-treated membranes were characterized through Fourier transform infrared spectroscopy, goniometry, and zeta-potential analysis to analyze the treatment-induced changes in the intrinsic properties of the membrane. Furthermore, the changes in permeability induced by the post-treatment were evaluated via the measurement of water flux, NaCl rejection, and molecular weight cutoff

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Tran, Mai Lien, Ying-Shr Chen, and Ruey-Shin Juang. "Fouling Analysis in One-Stage Ultrafiltration of Precipitation-Treated Bacillus subtilis Fermentation Liquors for Biosurfactant Recovery." Membranes 12, no. 11 (2022): 1057. http://dx.doi.org/10.3390/membranes12111057.

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Primary recovery of surfactin from precipitation-pretreated fermentation broths of Bacillus subtilis ATCC 21332 culture by one-stage dead-end and cross-flow ultrafiltration (UF) was studied. Dead-end experiments were first performed to select suitable conditions, including the amount of added ethanol—a micelle-destabilizing solvent (0–70 vol%), type (polyethersulfone, polyacrylonitrile, poly(vinylidene fluoride)) and molecular-weight cut-off (MWCO, 30–100 kDa) of the membrane in the surfactin concentration range of 0.25–1.23 g/L. Then, the cross-flow UF experiments were conducted to check the

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Feng, Guoying, Runkai Su, Zhiguo Yan, et al. "Polyelectrolyte complex nanofiltration membranes with low MWCO for pharmaceuticals removal." Separation and Purification Technology 325 (November 2023): 124669. http://dx.doi.org/10.1016/j.seppur.2023.124669.

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Yengin, Cigdem, Emrah Kilinc, Fatma Gulay Der, Mehmet Can Sezgin, and Ilayda Alcin. "Optimization of Extraction Parameters of Reverse Iontophoretic Determination of Blood Glucose in an Artificial Skin Model." Current Analytical Chemistry 16, no. 6 (2020): 722–37. http://dx.doi.org/10.2174/1573411015666190710232858.

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Background: Reverse İontophoresis (RI) is one of the promising non-invasive technologies. It relies on the transition of low magnitude current through the skin and thus glucose measurement becomes possible as it is extracted from the surface during this porter current flow. Objective: This paper deals with the development and optimization of an RI determination method for glucose. CE dialysis membrane based artificial skin model was developed and the dependence of RI extraction on various experimental parameters was investigated. Method: Dependence of RI extraction performance on noble electro

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